Hose-coupling



A. A. EWALD.

HOSE COUPLING.

APPLICATION FILED APR. 17. i919 RENEWED MAY 3.1920.

Patented Dec. 7, 1920.

avwemtoz UNITED STATES PATENT OFFICE.

ARNO A. EWA'LD, OF OAKFIELD, WISCONSIN.

ROS E-COUPLING.

Specification of Letters Patent.

Patented Dec. '7, 1920.

Application filed April 17, 1919, Serial No. 290,726. Renewed May 3,1920. Serial No. 378,654,

clear, and exact description of the invention,

' hose couplings bicycle pump manufacture,

such as will enable others skilled in the art to which it appertains tomake and use the same.

My invention relates to improvements in designed primarily for use inconnection with compressed air hoses, such as those used for inflatingautomobile tires, and blowing chips, shavings, etc., from numerous kindsof machines. The evice is also applicable to the hoses of weldingmachines, vulcanizers, and in fact upon any kind of apparatus usingflexible air hose.

The principal object of to provide a coup equal advantage upon ard sizesof air hose, ranging tubing to hose ternal diameter of approximatelyquarters of an inch.

A further object is to provide a coupling which may not only be usedupon the well known rubber hoses having no covering, but upon metalcovered hoses such as those now commonly used for the inflation ofautomobile tires.

Yet another object is to provide a coupling of extreme simplicity andinexpensive and one which may be quickly and easily adapted to theparticular type or the invention is practically all standfrom the usualhaving an exthreesize of hose with which it is to be used.

With the fore oing .in view, the invention resides in t e novel featuresof construction and association of parts hereinafter described andclaimed, the descriptive matter being supplemented by the accompanyingdrawings. 1

Figure 1 is a longitudinal section of a coupling constructed inaccordance with my invention, showing the same installed for connectinga metal covered air hose to the air discharge head commonly used forinfl'ating vehicle tires.

Fi 2 is a side elevation partly in section, showing the manner in whicha thick walled rubber hose is clamped in the coupling.

Figs. 3 and 4 are views similar to Fig. 2,

illustrating the manner which bushlngs ling which may be used to areused for adapting the coupling to hoses of comparatively small size.

Fig. 5 1s a vertical transverse section on the plane lndioated by theline 5-5 of Fig 4.

n the drawings above briefly described, the numeral 1 designates acylindrical plug preferably having a hexagonal head 2 on one end forengagement with a wrench, wh le the other end 3 of said body is ofconlcal formation, the peripheral surface 4 of sald conlcal end beingcurved inwardly from the base to the apex of the cone. By thisformation, the end 3 of the plug 1 may be inserted in any of the airhoses having standard internal diameters. The plug is of course providedwith a bore 5 for communlcation with the hose and this bore iscounterbored and threaded at 6 for attachmentto an air discharge head 7or any other part 1n connection with which the coupling is to be used.

'A hose clamping sleeve 8 is counterbored and threaded at one end asseen at 9, said counterbored end being threaded =onthe cyllndrical partof the plug 1. The juncture of the bore and counterbore of the sleeve 8forms an internal circumferential shoulder 10, and said bore is providedwith relatively coarse threads 11 adapted either to thread on thewrappings 11 of the metal covered air hose as seen in Fig. 1. or toembed in the exterior of a thick walled rubber hose as depicted in Fig.2. In either instance, when the plug 1 is tightly threaded into thesleeve 8, the tube will be anchored in an air tight manner. beinggripped tightly between the conical plug end 3 and the sleeve. When usedas seen in Fig. 2, both the threads 11 and the shoulder 10 areinstrumental in holding the hose against slippage.

For adapting the coupling for use on comparatively small sizes of hose,I provide an outer bushing 12 and an inner bushing 13, and one or bothof these bushings may be used, according to the external diameter of thehose. The bushing 12 is provided with an external rib 14 received in thecounterbore 9 and bearing against the shoulder 10, said rib being formedon the inner end of the bushing, which end is counterbored. at 15 toprovide an internal shoulder 16. When only the bushing 12 is used (seeFig. 3) the inner end of said bushing and the shoulder 16 embed in theexterior of the hose and hold the same against slippage, and

when the inner bushing 13 is employed, a peripheral rib 17 thereof isreceived in the counterbore 15 and bears against the shoulder 16. Theinner end of the bushing 13 is counterbored at 18 to provide an internalshoulder 19, and the inner edge of the bushing 13, together With itsshoulder 19, tightly grip the smaller sizes of hose.

By manufacturing the coupling in the novel manner shown and described,it meets all conditions encountered in connecting compressed air hosesupon numerous forms of apparatus and machines, and particular attentionis directed to the fact that re-. gardless of the internal or externaldiameter of the hose, the coupling may be used to equal advantagethereon by inserting the proper number of bushings or by omltting all ofsuch bushings, as required.

The device is extremely simple and inexpensive, yet is of greatadvantage and since excellent results have been obtained from thedetails disclosed, they may well be followed, but it is to be understoodthat within the scope of the invention as claimed, numerous minorchanges may well be made.

I claim:

1. In ahose coupling, a cylindrical longitudinally bored plug having awrench head on one end, the other end of said plug being in the form ofa cone whose peripheral surface is curved inwardly from its base to itsapex for insertion hoses having different standard internal diameters,and a hose clamping sleeve counterbored at one end to provide aninternal shoulder adapted to embed in the covering of certain styles ofhoses, or to abut a bushinto the ends of ing for a smaller hose, saidcounterbored .end being threaded on the cylindrical porthe smaller endof said bore having coarse rounded threads adapted either to embed inthe flexible coverings of certain forms of hose or to thread on thewrapping of a metal covered hose.

2. In a hose coupling, a cylindrical, bored plug having a conical endWhose peripheral surface is curved inwardy from the base to the apex ofthe cone, for insertion into the ends of hoses having different standardinternal diameters, a hose clamping sleeve counterbored at one end toprovide an internal shoulder, said counterbored end being threaded onthe cylindrical portion of said plug, a bushing in the other end of saidsleeve having an external, circumferential rib at its inner end forcontact with said shoulder of the sleeve, said inner end of said bushingbeing counterbored, for a short distance to provide a'shoulder adaptedfor antislipping engagement witha relatively small hose, andanadditional bushing in said first named bushing having an external ribreceived in the counterbore thereof, said additional bushing beingcounterbored at its inner end to provide a shoulder adapted to engage astill smaller hose.

3. A structure as specified in claim 2, said other end of said sleevehaving coarseinternal threads adapted either to thread on the wrappingsof a metal covered hose, or to embed in the exterior of a thick walledrubber hose.

In testimony whereof I have hereunto set my hand.

a ARNo A. EWALD.

tion of said plug,

